it's balanced on bronze.
Not on Silver or Gold.
I'd go so far as to say the weapons and powers are all tuned specifically for bronze.
I've just hit 8000 Apex rating and it's very clear to me that this is the case. The update did not address Assault Rifles in any meaningful way for difficulties higher than bronze.
Every Semi-Auto AR is useless on Gold, with a level 20 character.
Every Full Auto and Burst fire AR is the same with varying degrees - takes at least an entire clip to kill one unshielded unarmoured mob.
Every Pistol the same.
Not sure about Shotguns.
At the moment i'm using the raptor Sniper rifle as an assault rifle. And it's adequate.
being able to use all of the weapons or basically, having a choice of them on gold would be great, but right now, that's not how it's working. Which is kind of depressing, and frustrating given how much obvious work has gone into the multiplayer.